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首页> 外文期刊>Journal of Applied Polymer Science >Tailoring block-copolyesters by reactive blending of polyethylene terephthalate and polyethylene naphthalate using statistical design of experiments
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Tailoring block-copolyesters by reactive blending of polyethylene terephthalate and polyethylene naphthalate using statistical design of experiments

机译：使用实验统计设计通过聚对苯二甲酸乙二醇酯和聚萘二甲酸乙二醇酯的反应共混来定制嵌段共聚酯

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摘要

Block-copolyesters of polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) were synthesized via reactive extrusion. The influence of processing parameters on the material properties on a molecular scale like degree of trans-esterification, block length, and degree of randomness were investigated. The varied process factors were extrusion temperature and rotational speed. The effects of process parameter variation were investigated by H-1-NMR-spectroscopy. The experimental results show a clear dependence of the molecular properties on the processing conditions. By using statistical experimental design (DoE), it was possible to prepare defined copolyesters from PET and PEN without addition of further chemicals. With a degree of randomness between 0.05 and 0.5, the presence of an actual copolyester was confirmed when appropriate extrusion conditions were applied. The reactive extrusion process was confirmed to be suitable to produce defined block-copolyesters in a predictable and reproducible way. It was possible to produce designed sequence lengths, which could be adjusted within a range of 11-136 repeating units in the case of PET and, in the case of PEN, of 2.5-26. The produced materials can be used as barrier materials or barrier coatings to protect substrates against molecular oxygen and water vapour, e.g., in organic photovoltaic applications or food packaging. The described method is a one-pot alternative method to the previously described chemical recycling pathway. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41997.
机译：通过反应挤出合成了聚对苯二甲酸乙二醇酯（PET）和聚萘二甲酸乙二醇酯（PEN）的嵌段共聚酯。研究了工艺参数对材料性能的影响，如酯交换度，嵌段长度和无规度等分子尺度。不同的工艺因素是挤出温度和转速。通过H-1-NMR光谱研究了工艺参数变化的影响。实验结果表明分子性质对加工条件的明显依赖。通过使用统计实验设计（DoE），可以从PET和PEN制备确定的共聚酯，而无需添加其他化学物质。在0.05至0.5之间的无规度下，当施加适当的挤出条件时，确认存在实际的共聚酯。证实反应性挤出工艺适合于以可预测和可再现的方式生产确定的嵌段共聚酯。可以产生设计的序列长度，对于PET而言，可以在11-136个重复单元的范围内进行调整;对于PEN而言，可以在2.5-26的范围内进行调整。所产生的材料可用作屏障材料或屏障涂层，以保护基材免受分子氧和水蒸气的侵害，例如在有机光伏应用或食品包装中。所描述的方法是先前描述的化学回收途径的一锅法。 （c）2015 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41997。

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